Manufacture of treatment of filaments, yarns, or threads of cellulose derivatives



Sept. 11, 1934. H DREYFUS 1,972,924

MANU URE 0R EATMEN'I OF FILAMENTS, YARNS,

THREAD F CELLULO DERIVATIVES Filed Aug. 2,

REYFUS H ENRY ven Patented Sept. 11, 1934 UNITED STATES I MANUFACTURE OR TREATIHENT OF FILA- MENTS, YARNS, OR THREADS OF CELLU- LOSE DERIVATIVES Henry Dreyfus, London, England Application August 2, 1929, Serial No. 382,900

In Great Britain 1 Claim.

This invention relates to the treatment of artificial filaments, yarns or threads.

According to the invention, such filaments, yarns or threads, (hereafter referred to as 5 threads) are treated or coated with any .re-

quired dressing while they are travelling from one point to another, and are subsequently-subjected to a drying operation, the treating or coating and drying forming a continuous operation in which the threads after receiving the dressing do not come into contact with any part of the apparatus untilthe drying is completed. The dressed threads are thus in no way deleteriously affected by rubbing or other action which might tend to remove the dressing while it is in a wet or moist state, and further, there are no parts of the apparatus such as thread guides or rollers to receive an accumulation of dressing removed from the threads, which accumulation of dressing might also have a detrimental effect on threads passing thereover.

The treatment may be efiected continuously with the production of the threads, whether by the dry or evaporative method, or by the wet or 2 coagulation method, the dressing being applied to the threads after they have left the metier or bath in which they have been spun, but while the process according tothe invention is particularly advantageous for treating threads continuously with their production, it is not limited thereto, but may be carried out at any sub- 1 sequent stage of their manufacture. For instance a dressing may be applied to threads during a bobbin-to-bobbin, a hank-to-bobbin or any 3 other suitable winding operation.

The dressing may be applied in any suitable way, for instance, by spraying the threads, or by passing them over, or otherwise bringing them into contact with, a roller, or drum whose surface iskept moist with the dressing. Preferably the filaments or threadsonly make a light contact with the dressing-applying means. When a roller or drum is employed, its peripheral speed may be the same as the speed of the threads, but may, if desired, be greater or less than this speed to exert a wiping action in applying the dressing. Examples of the forms of rollers which may be used are rollers provided with circumferential grooves in which the filaments or threads lie, and V-edged rollers arranged at an angle to the path of the filaments or threads. The rollers are supplied with dressing in any suitable way, for instance, ,by dipping into a trough containing the dressing.

The drying may be effected by passing the August 9, 1928 thread through a heated casing, or through a casing through which a drying medium, which may be heated or not, is caused to pass, the casing being so arranged that it does not come into contact with the threads. Alternatively, a stream of air or other gaseous drying medium, heated or not, may be directed on to the threads.

Two forms of apparatus for carrying out the invention will now be described by way of example with reference to the accompanying drawing, but it is to.be understood that the following description is in no way limitative.

Fig. 1 shows diagrammatically apparatus for the treating or coating and drying of artificial filaments or threads continuously with their production.

Fig. 2 is a section on the line 22 of Fig. 1, Fig. 3 shows an alternative form of drying device; and 3 Fig. 4 is a section on the line 44 of Fig. 3.

Referring to Fig. 1, 5 represents a dry-spinning cell or chamber and 6 a thread of associated filaments issuing therefrom. The thread 6 is drawn from the cell 5 by a feed roller 7, and on leaving the feed roller, the thread passes over a coating roller 8, making light, continuous contact therewith, and receiving a uniform coating of material supplied to the roller 8 from'a trough 9.

In order to dry the coated thread, a heated chamber 10 is arranged to surround the thread on its passage from the coating roller, the chamber 10 being provided with a jacket 11 and with a an inlet 12 and outlets 13 for a heating medium such as steam, hot water, or heated air. The

' thread passes directlyinto the chamber 10 without the interposition of thread guides or the like. In order to avoid threading the thread 5 through the chamber 10, a slot 14 is formed in the chamber 10 and in the jacket 11, through which the thread can be readily laid or drawn and passed into the chamber.

- It will be seen that after leaving the roller 8, the thread does not make contact with any part of the apparatus until it has emerged from the I drying chamber 10. The temperature of the loo chamber and its length are such that the thread is completely dried during its passage through the chamber. The dried thread proceeds to a thread guide 15 and to a winding or twisting and winding device, such as, for example, the capspinning apparatus 16. A further feed-roller (not shown) may be interposed between the chamber 10 and the guide 15.

In the modified arrangement shown in Figs. 3 and 4, the coated thread on leaving the roller 8 119 dition from the chamber.

along the length of the chamber for the intro-[ enters a chamber 1'7 which substantially surrounds the thread and into which is introduced a current of heated air or other gas from a pipe 18, the temperature and amount of air'or other gas together with the length of the chamber 17 being such that the thread emerges in dry con- A slot 19 is formed duction of the thread.

The apparatus outlined above may also be used for the treating or coating and drying of filaments or threads in bobbin-to-bobbin or other winding operations.

The invention is not restricted to the application of any particular dressing, but it is especially of artificial filaments, yarns or threads having as a basis cellulose acetate or other organic substitution derivatives of cellulose, such as cellulose formate, propionate, or butyrate, ethyl, methyl, or benzyl cellulose, and the condensation products of cellulose and glycols or other polyhydric alcohols, or comprising reconstituted cellulose, such as viscose, cuprammonium, or nitrocelulose artificial silk.

What I claim and desire to secure by Letters Patent is:-

Apparatus for the continuous production of a treated artificial thread which comprises apparatus for the production of a thread by the evaporative method, coating means contacting with the'thread produced in such apparatus for applying a dressing thereto, collecting means for the thread, and drying means comprising a heat- HENRY DREYFUS. 

